Haste
Whenever this creature or another Ally you control enters, you may have Ally creatures you control get +1/+0 until end of turn.
Illustrated by Adi Granov · Worldwake · #71
There are no rulings for Akoum Battlesinger.
Whenever this creature or another Ally you control enters, you may have Ally creatures you control gain first strike until end of turn.
Rally — Whenever this creature or another Ally you control enters, creatures you control gain menace until end of turn. (A creature with menace can't be blocked except by two or more creatures.)
Whenever another artifact you control enters, this creature gets +1/+0 until end of turn.
When this creature enters, creatures you control get +1/+0 and gain haste until end of turn.
Whenever another creature you control enters, this creature gets +1/+0 and gains trample until end of turn. (It can deal excess combat damage to the player or planeswalker it's attacking.)
Whenever another creature you control with power 2 or less enters, this creature gets +2/+0 until end of turn.